Is it possible to access the data from a detached device from an
mirrored pool.

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Given a two device mirrored pool, if you zpool detach one device. Can
the data on the removed device be accessed in some means. From what I
can see you can attach the device back to the original pool, but this
will simply re-silver everything from the already attached device back
onto this device.

If I attached this device to a different pool it will simply get
overwritten.